Wind turbine generator super capacitor mobile direct current discharge device

Abstract

The utility model belongs to the technical field of super capacitor discharge devices, and discloses a wind turbine generator super capacitor mobile DC discharge device, the upper side of a box body is connected with a box cover through a hinge, a discharge loop is arranged in the box body, and the discharge loop is provided with an anode line and a cathode line. The inner ends of the two connecting lines are respectively communicated with the positive line and the negative line; three energy-consuming resistors are connected in series between the positive line and the negative line, the positive line and the negative line are respectively connected with a contactor KM1, two ends of the energy-consuming resistor R1 and the energy-consuming resistor R2, and two ends of the energy-consuming resistor R2 and the energy-consuming resistor R3 are respectively connected in parallel with a contactor KM2. According to the utility model, the three energy-consuming resistors are connected to the circuit, and the series discharge and parallel discharge of the resistors are realized by closing the main contacts of the two contactors, so that direct grounding of the super capacitor due to misoperation can be effectively prevented, and personal injury and equipment damage caused by misoperation can be effectively prevented.

Description

Technical Field

[0001] This utility model belongs to the technical field of supercapacitor discharge devices, and in particular relates to a mobile DC discharge device for wind turbine supercapacitors. Background Technology

[0002] When the pitch inverter of a wind turbine pitch system fails, the pitch charger is directly connected to the supercapacitor and the pitch inverter. At this time, the supercapacitor carries a large amount of charge and needs to be fully discharged before maintenance work can be carried out.

[0003] When replacing a pitch inverter, the conventional discharge method carries a high risk. Typically, workers discharge by directly grounding a single wire. This wire has low resistance, high current carrying capacity, and generates significant heat, making it highly dangerous. Because of the high heat generation, intermittent discharge is necessary, resulting in a prolonged discharge time.

[0004] When maintenance personnel replace AC2 capacitors or supercapacitors (supercapacitor voltage 60VDC / capacity 125F), the supercapacitors carry a large amount of charge, posing a safety hazard to the workers. There are currently no portable capacitor discharge devices on the market. Therefore, this invention provides a mobile DC discharge device for wind turbine supercapacitors. Utility Model Content

[0005] To overcome the problems existing in related technologies, this utility model provides a mobile DC discharge device for supercapacitors in wind turbine generators.

[0006] The technical solution of this utility model is as follows: A mobile DC discharge device for a supercapacitor of a wind turbine is provided with a box, and a box cover is connected to the upper side of the box by a hinge. Two through holes are opened on the side of the box, and a connecting wire is passed through each of the two through holes. The outer ends of the two connecting wires are respectively connected to a fixing clip.

[0007] The box is equipped with a discharge circuit, which has a positive line and a negative line. The inner ends of the two connecting wires are respectively connected to the positive line and the negative line.

[0008] A series of energy-consuming resistors R1, R2, and R3 are connected between the positive and negative lines. An ammeter is connected between the positive line and the energy-consuming resistor R1. A contactor KM1 is connected to the positive and negative lines respectively. A contactor KM2 is connected in parallel across the two ends of energy-consuming resistors R1 and R2, and across the two ends of energy-consuming resistors R2 and R3 respectively.

[0009] In one embodiment, a first start button, a second start button, and a third start button are embedded on the outside of the box cover. The first start button is connected between the second start button and the positive line. The second start button is connected to contactor KM1 via a connecting wire. The third start button is connected to contactor KM2 via a connecting wire.

[0010] In one embodiment, a locking device is fitted on the outside of the lid to engage with the box body, and a handle is connected to the side of the box body via a hinge.

[0011] In one embodiment, an indicator light is embedded on the outside of the cover, and the indicator light is connected to the discharge circuit via a connecting wire.

[0012] In one embodiment, the scale panel of the ammeter is mounted on the outside of the box cover;

[0013] In one embodiment, the energy-consuming resistors R1, R2, and R3 are all aluminum-cased discharge current-limiting resistors.

[0014] Based on the above technical solution, the beneficial effects of this utility model are as follows: This utility model connects three energy-consuming resistors to the circuit and uses the closing of the main contacts of contactors KM1 and KM2 to achieve series and parallel discharge of the resistors. The resistance value is high at the initial stage of discharge, and the resistance value is reduced when the voltage drops to a certain level, thereby accelerating the discharge time. By using step-by-step discharge of the supercapacitor, it effectively prevents the supercapacitor from being directly grounded due to misoperation, and effectively prevents personal injury and equipment damage caused by misoperation.

[0015] This invention improves operational safety, shortens operation time, and indirectly increases the availability of the turbine unit. The discharge time is reduced from 4 hours to approximately 20 minutes. Currently, there are no portable capacitor discharge devices on the market. This invention offers excellent safety, employing an aluminum-cased discharge current-limiting resistor. All components are housed in a portable enclosure, making operation simple and eliminating cumbersome procedures. The possibility of human error is low, filling a gap in the market for portable capacitor discharge equipment for wind turbine units and demonstrating a certain level of advancement within the industry.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the disclosure of this utility model. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0018] Figure 1This is a schematic diagram of the structure of the mobile DC discharge device for supercapacitors in wind turbine generators provided in this embodiment of the utility model;

[0019] Figure 2 This is a circuit diagram of the discharge device provided in this embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the connection structure between the start button and the contactor provided in an embodiment of this utility model;

[0021] In the diagram: 1. Box body; 2. Box cover; 3. Ammeter; 4. First start button; 5. Second start button; 6. Third start button; 7. Handle; 8. Lock; 9. Through hole; 10. Connecting wire; 11. Fixing clip; 12. Indicator light. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0023] like Figure 1 As shown in the figure, the upper side of the housing 1 of the mobile DC discharge device for supercapacitors of wind turbine provided in this embodiment of the utility model is connected to the housing cover 2 by a hinge. Two through holes 9 are opened on the side of the housing 1, and a connecting wire 10 is respectively inserted into the two through holes 9. The outer ends of the two connecting wires 10 are respectively connected to the fixing clips 11. A discharge circuit is provided inside the housing 1.

[0024] Preferably, in this embodiment of the invention, the outer side of the lid 2 is fitted with a locking lock 8 that cooperates with the box body 1, and the side of the box body 1 is connected to a handle 7 by a hinge.

[0025] Preferably, in this embodiment of the invention, an indicator light 12 is embedded on the outside of the box cover 2, and the indicator light 12 is connected to the discharge circuit through the connecting line 10.

[0026] As a preferred embodiment, the outer side of the box cover 2 in this utility model embodiment is fitted with a first start button 4, a second start button 5 and a third start button 6.

[0027] like Figure 2 As shown, the discharge circuit in this embodiment of the present invention is provided with a positive electrode line and a negative electrode line, and the two connecting wires 10 are respectively connected to the positive electrode line and the negative electrode line.

[0028] A series of energy-consuming resistors R1, R2, and R3 are connected between the positive and negative lines. An ammeter 3 is connected between the positive line and the energy-consuming resistor R1. A contactor KM1 is connected to the positive and negative lines respectively. A contactor KM2 is connected in parallel across the two ends of energy-consuming resistors R1 and R2, and across the two ends of energy-consuming resistors R2 and R3 respectively.

[0029] like Figure 3 As shown, SB1 is the first start button 4, SB2 is the second start button 5, and SB3 is the third start button 6. In this embodiment of the present invention, the first start button 4 is connected between the second start button 5 and the positive line. The second start button 5 is connected to the contactor KM1 through the connecting line 10, and the third start button 6 is connected to the contactor KM2 through the connecting line 10.

[0030] Preferably, in this embodiment of the present invention, the scale panel of the ammeter 3 is embedded on the outside of the box cover 2;

[0031] Preferably, in the embodiments of this utility model, the energy-consuming resistors R1, R2, and R3 are all aluminum-cased discharge current-limiting resistors.

[0032] The working principle of this invention is as follows: When the voltage is relatively high, the voltage and current are both relatively large, so the required resistance value of the energy-consuming resistor is relatively large. First, connect the fixing clips 11 of the positive and negative lines to the positive and negative terminals of the supercapacitor, respectively; after pressing the first start button 4, press the second start button 5. The coil of the contactor KM1 is energized and attracted. When the main contacts are closed, the energy-consuming resistors R1, R2, and R3 are in series, which can withstand a large voltage and current.

[0033] When the voltage drops to half of the remaining voltage, the current also decreases. At this point, the resistance of the energy-consuming resistor is reduced to maintain a constant discharge rate. When the voltage drops to half of the remaining voltage, pressing the third start button 6 energizes the coil of contactor KM2, closing the main contacts. Energy-consuming resistors R1, R2, and R3 are connected in parallel, reducing their resistance and rapidly dissipating the remaining charge to 0V, ensuring personnel safety. Because the auxiliary contacts of contactor KM1 are connected in series in the control circuit of contactor KM2 coil, this parallel circuit discharges the remaining charge when it is relatively high, preventing the energy-consuming resistors from burning out.

[0034] This invention features a simple structure and principle, and has been used multiple times in a Goldwind GW82 / 1500 wind farm with good results. Operation is simple. It is applicable to the discharge of all capacitive components within the Goldwind GW82 / 1500 unit. This invention offers good safety, employing an aluminum-cased discharge current-limiting resistor. All components are housed in a portable discharge box, simplifying operation and eliminating cumbersome procedures, thus minimizing the possibility of human error.

[0035] This invention has been widely used in the supercapacitor discharge of the pitch control unit of Goldwind GW82 / 1500 in a certain wind farm. When maintenance personnel determine that the supercapacitor needs to be discharged, they can carry this device to carry out maintenance work. According to feedback from maintenance personnel, the effect of using it is good.

[0036] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features, and such modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A mobile DC discharge device for supercapacitors in wind turbine generators, characterized in that, The box (1) is provided, and the upper side of the box (1) is connected to the lid (2) by a hinge. The side of the box (1) has two through holes (9), and a connecting wire (10) is passed through each of the two through holes (9). The outer ends of the two connecting wires (10) are respectively connected to fixing clips (11). The box (1) is equipped with a discharge circuit, which is provided with a positive line and a negative line. The inner ends of the two connecting wires (10) are respectively connected to the positive line and the negative line. A series of energy-consuming resistors R1, R2, and R3 are connected between the positive and negative lines. An ammeter (3) is connected between the positive line and the energy-consuming resistor R1. A contactor KM1 is connected to the positive and negative lines respectively. A contactor KM2 is connected in parallel between the two ends of the energy-consuming resistors R1 and R2, and between the two ends of the energy-consuming resistors R2 and R3 respectively.

2. The mobile DC discharge device for supercapacitors in wind turbine generators according to claim 1, characterized in that, The outer side of the cover (2) is fitted with a first start button (4), a second start button (5) and a third start button (6). The first start button (4) is connected between the second start button (5) and the positive line. The second start button (5) is connected to the contactor KM1 through a connecting line (10). The third start button (6) is connected to the contactor KM2 through a connecting line (10).

3. The mobile DC discharge device for supercapacitors in wind turbine generators according to claim 1, characterized in that, The outer side of the lid (2) is fitted with a locking lock (8) that cooperates with the box body (1), and the side of the box body (1) is connected to a handle (7) by a hinge.

4. The mobile DC discharge device for supercapacitors in wind turbine generators according to claim 1, characterized in that, An indicator light (12) is embedded on the outside of the box cover (2), and the indicator light (12) is connected to the discharge circuit through a connecting wire (10).

5. The mobile DC discharge device for supercapacitors in wind turbine generators according to claim 1, characterized in that, The scale panel of the ammeter (3) is embedded on the outside of the box cover (2).

6. The mobile DC discharge device for supercapacitors in wind turbine generators according to claim 1, characterized in that, The energy-consuming resistors R1, R2, and R3 are all aluminum-cased discharge current-limiting resistors.

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